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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d9d2b58e85e20efc0e79cee511c8adf555ea54c457e3253f334915c6e0f686' 
  AND token = 'H87Q5ypKsIaJ7pKlbpehk8fqsfFVffTK6yNAIiRem50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}